Unit not powering up. New lamp installed but

https://www.manualslib.com/manual/703453/Runco-Rs-900.html?page=73&term=lamp+hours&selected=3#manual

https://www.manualslib.com/manual/703453/Runco-Rs-900.html?page=83#manual

https://www.manualslib.com/manual/703453/Runco-Rs-900.html?page=85&term=reset&selected=19#manual

https://www.manualslib.com/manual/142911/Runco-Runco-Video-Xtreme-Vx-2ix.html?page=66#manual Manual

Contact the manufacturer

RUNCO INTERNATIONAL, INC. Attn: Customer Service Department 2900 Faber Street Union City, CA 94587 Ph: (510) 324-7777 Fax: (510) 324-9300 Toll Free: (800) 23-RUNCO

It appears that Runco may use the same remote codes as NEC projectors. Maybe try a universal remote that has codes for NEC projectors.

Likely the fan blades are dirty and out of balance. If this projector is in a dusty or smoky place you will need to clean them (or have them cleaned by a tech) often. If you are not good with electronics, I suggest taking it to a dealer. If you can get the covers off properly, you will need use a can of compressed air to carefully blow out the projector and fan blades.

The capacitors on the power supply need to be replaced. When you take apart the projector, and then remove the power supply (it's the section that the power cord goes to) and open it up. Look for the little can capacitors and see if any of them are bulging on top. That is the sign that they've blown. Replace the big ones (about 5) for about $5 in parts. Reassemble and test by turning it on. Search for YouTube video. This is an easy repair.

Look inside the lamp. If you look into it if you see any white build up at its base, replace it. Need help, let me know.

most likely you have a bad lamp

Using the remote control for your projector, turn the unit on, then select 'menu' on the remote. On the menu that pops up in the screen, select 'SERVICE', then 'DISPLAY DEVICE', then 'INSTALLATION'... once you select that, scroll over to the "RESET" under the lamp hours... this should reset it.

Here is a link to the owners manual for your unit.

http://runco.com/legacy_prods/legacy_manuals/VX4000d_5000d_manual-v3-1.pdf

You need to use the remote, press the Menu button... on the menu that pops up on the screen, use the remote to scroll down to where it says "aspect ratio", and then select enter.

From that menu, you can select all the different aspect ratios that your Runco can perform.

Here is a link for the owners manual, straight from Runco.

http://runco.com/legacy_prods/legacy_manuals/CL-510_510LT.pdf

I have a great deal of experience with that projector in particular. 
The burning smell along with the circle on the screen can be one of two thing in the same general area. Both are not good.
The lamp assembly has its own dedicated cooling fans. these fans can sometimes **** in dust and insects. the lamp runs at a very high temperature and can burn those things quickly. I have often found old lamps with particles fused to the glass.
The other situation is that the lamp burned something and it got stuck to the glass somewhere in the light path. 
if I remember right the projector monitors the temprature of the bulb and will shutdown if it gets too hot.
Runco is based in california and has a great turn around time on projectors. Unfortunately with Runco you would be hard pressed to find a technician that wouldn't just send it to them for repairs anyways. The major down side with Runco is that customers cannot talk directly to engineers or service men. 
Locate a Runco authorized retailer in your area, check runcoes site. and give them a call to see if they cant send it to runco for you. if you cannot find one in your area call Roscor or Blair & Associates in Chicago.